Hi Wayne,

>> current to just under 1ma, but if you change the value of R1, you should
be
>>able to set the current to what you like (within reason!).

>Nice circuit, nice drawing.

Thanks.  Electronics is what we do for a living.

>One question.
>
>Have you checked the brilliance of the LED at that low current?  Likely
>some of the smaller ones will work fine.

Most LED's will light dimly at this current.  When I did my tests on the
de-ionised water at 0.2ma, you could see the led lit very dimly.  It was
quite a bit brighter when the test stopped at 0.8ma

>I would like to point out the disadvantages of the constant
>current.  Using constant current, the LED will not serve as a visual
>indicator of current flow which allows the rejection of inferior water.
>
>I realize this is not important to many, but it is to me, because I have
>found so much junk distilled water.
>Plus I am in the habit of doing it, my eye is trained, but I am not close
>minded.
>
>So, the best of both worlds..... build a nice unit with a switch.  This
>would allow the use of constant current and NON-constant current when
needed.

When I used the silver rods on 'home made' distilled water, it turned the
water cloudy and the current was high.  This made the solution un-drinkable.
I understand that you are referring to the impurities in this way, but if I
was to use ordinary TAP water with the current limiter, would this also be a
very bad idea?  I mean is the particle size going to get larger with TAP
water even though the current is the same, or is it because you don't like
the TAP water anyway?  (I am trying to understand what makes the CS safer
and not to turn a funny shade of grey / blue!)

Thanks,
Dave.



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